Hi guys,
just working on a model and sent it to my iPad to send out and found that all my extruded parts fail to load in iOS, its only loading/displaying polysurfaces ? I tried exporting as a Rhino 4 model and the fault persists.

Don’t have any idea about this. Extrusion objects don’t have a render mesh saved in the file, which might explain the missing parts, but the iPad app creates extrusion meshes when they are missing, so what you describe shouldn’t happen.